Commit | Line | Data |
---|---|---|
704232c2 JB |
1 | /* |
2 | * This is the linux wireless configuration interface. | |
3 | * | |
f59ac048 | 4 | * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net> |
704232c2 JB |
5 | */ |
6 | ||
7 | #include <linux/if.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/err.h> | |
704232c2 JB |
10 | #include <linux/list.h> |
11 | #include <linux/nl80211.h> | |
12 | #include <linux/debugfs.h> | |
13 | #include <linux/notifier.h> | |
14 | #include <linux/device.h> | |
15 | #include <net/genetlink.h> | |
16 | #include <net/cfg80211.h> | |
17 | #include <net/wireless.h> | |
55682965 | 18 | #include "nl80211.h" |
704232c2 JB |
19 | #include "core.h" |
20 | #include "sysfs.h" | |
21 | ||
22 | /* name for sysfs, %d is appended */ | |
23 | #define PHY_NAME "phy" | |
24 | ||
25 | MODULE_AUTHOR("Johannes Berg"); | |
26 | MODULE_LICENSE("GPL"); | |
27 | MODULE_DESCRIPTION("wireless configuration support"); | |
28 | ||
29 | /* RCU might be appropriate here since we usually | |
30 | * only read the list, and that can happen quite | |
31 | * often because we need to do it for each command */ | |
32 | LIST_HEAD(cfg80211_drv_list); | |
a1794390 LR |
33 | |
34 | /* | |
e38f8a7a LR |
35 | * This is used to protect the cfg80211_drv_list, cfg80211_regdomain, |
36 | * country_ie_regdomain, the reg_beacon_list and the the last regulatory | |
37 | * request receipt (last_request). | |
a1794390 LR |
38 | */ |
39 | DEFINE_MUTEX(cfg80211_mutex); | |
704232c2 JB |
40 | |
41 | /* for debugfs */ | |
42 | static struct dentry *ieee80211_debugfs_dir; | |
43 | ||
806a9e39 LR |
44 | /* requires cfg80211_mutex to be held! */ |
45 | struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx) | |
55682965 JB |
46 | { |
47 | struct cfg80211_registered_device *result = NULL, *drv; | |
48 | ||
85fd129a LR |
49 | if (!wiphy_idx_valid(wiphy_idx)) |
50 | return NULL; | |
51 | ||
761cf7ec LR |
52 | assert_cfg80211_lock(); |
53 | ||
55682965 | 54 | list_for_each_entry(drv, &cfg80211_drv_list, list) { |
b5850a7a | 55 | if (drv->wiphy_idx == wiphy_idx) { |
55682965 JB |
56 | result = drv; |
57 | break; | |
58 | } | |
59 | } | |
60 | ||
61 | return result; | |
62 | } | |
63 | ||
806a9e39 LR |
64 | int get_wiphy_idx(struct wiphy *wiphy) |
65 | { | |
66 | struct cfg80211_registered_device *drv; | |
67 | if (!wiphy) | |
68 | return WIPHY_IDX_STALE; | |
69 | drv = wiphy_to_dev(wiphy); | |
70 | return drv->wiphy_idx; | |
71 | } | |
72 | ||
73 | /* requires cfg80211_drv_mutex to be held! */ | |
74 | struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) | |
75 | { | |
76 | struct cfg80211_registered_device *drv; | |
77 | ||
78 | if (!wiphy_idx_valid(wiphy_idx)) | |
79 | return NULL; | |
80 | ||
81 | assert_cfg80211_lock(); | |
82 | ||
83 | drv = cfg80211_drv_by_wiphy_idx(wiphy_idx); | |
84 | if (!drv) | |
85 | return NULL; | |
86 | return &drv->wiphy; | |
87 | } | |
88 | ||
a1794390 | 89 | /* requires cfg80211_mutex to be held! */ |
4bbf4d56 | 90 | struct cfg80211_registered_device * |
55682965 JB |
91 | __cfg80211_drv_from_info(struct genl_info *info) |
92 | { | |
93 | int ifindex; | |
b5850a7a | 94 | struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; |
55682965 JB |
95 | struct net_device *dev; |
96 | int err = -EINVAL; | |
97 | ||
761cf7ec LR |
98 | assert_cfg80211_lock(); |
99 | ||
55682965 | 100 | if (info->attrs[NL80211_ATTR_WIPHY]) { |
b5850a7a | 101 | bywiphyidx = cfg80211_drv_by_wiphy_idx( |
55682965 JB |
102 | nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); |
103 | err = -ENODEV; | |
104 | } | |
105 | ||
106 | if (info->attrs[NL80211_ATTR_IFINDEX]) { | |
107 | ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); | |
108 | dev = dev_get_by_index(&init_net, ifindex); | |
109 | if (dev) { | |
110 | if (dev->ieee80211_ptr) | |
111 | byifidx = | |
112 | wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
113 | dev_put(dev); | |
114 | } | |
115 | err = -ENODEV; | |
116 | } | |
117 | ||
b5850a7a LR |
118 | if (bywiphyidx && byifidx) { |
119 | if (bywiphyidx != byifidx) | |
55682965 JB |
120 | return ERR_PTR(-EINVAL); |
121 | else | |
b5850a7a | 122 | return bywiphyidx; /* == byifidx */ |
55682965 | 123 | } |
b5850a7a LR |
124 | if (bywiphyidx) |
125 | return bywiphyidx; | |
55682965 JB |
126 | |
127 | if (byifidx) | |
128 | return byifidx; | |
129 | ||
130 | return ERR_PTR(err); | |
131 | } | |
132 | ||
133 | struct cfg80211_registered_device * | |
134 | cfg80211_get_dev_from_info(struct genl_info *info) | |
135 | { | |
136 | struct cfg80211_registered_device *drv; | |
137 | ||
a1794390 | 138 | mutex_lock(&cfg80211_mutex); |
55682965 JB |
139 | drv = __cfg80211_drv_from_info(info); |
140 | ||
141 | /* if it is not an error we grab the lock on | |
142 | * it to assure it won't be going away while | |
143 | * we operate on it */ | |
144 | if (!IS_ERR(drv)) | |
145 | mutex_lock(&drv->mtx); | |
146 | ||
a1794390 | 147 | mutex_unlock(&cfg80211_mutex); |
55682965 JB |
148 | |
149 | return drv; | |
150 | } | |
151 | ||
152 | struct cfg80211_registered_device * | |
153 | cfg80211_get_dev_from_ifindex(int ifindex) | |
154 | { | |
155 | struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV); | |
156 | struct net_device *dev; | |
157 | ||
a1794390 | 158 | mutex_lock(&cfg80211_mutex); |
55682965 JB |
159 | dev = dev_get_by_index(&init_net, ifindex); |
160 | if (!dev) | |
161 | goto out; | |
162 | if (dev->ieee80211_ptr) { | |
163 | drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
164 | mutex_lock(&drv->mtx); | |
165 | } else | |
166 | drv = ERR_PTR(-ENODEV); | |
167 | dev_put(dev); | |
168 | out: | |
a1794390 | 169 | mutex_unlock(&cfg80211_mutex); |
55682965 JB |
170 | return drv; |
171 | } | |
172 | ||
173 | void cfg80211_put_dev(struct cfg80211_registered_device *drv) | |
174 | { | |
175 | BUG_ON(IS_ERR(drv)); | |
176 | mutex_unlock(&drv->mtx); | |
177 | } | |
178 | ||
4bbf4d56 | 179 | /* requires cfg80211_mutex to be held */ |
55682965 JB |
180 | int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, |
181 | char *newname) | |
182 | { | |
2940bb69 | 183 | struct cfg80211_registered_device *drv; |
b5850a7a | 184 | int wiphy_idx, taken = -1, result, digits; |
55682965 | 185 | |
4bbf4d56 | 186 | assert_cfg80211_lock(); |
2940bb69 | 187 | |
55682965 | 188 | /* prohibit calling the thing phy%d when %d is not its number */ |
b5850a7a LR |
189 | sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); |
190 | if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { | |
191 | /* count number of places needed to print wiphy_idx */ | |
55682965 | 192 | digits = 1; |
b5850a7a | 193 | while (wiphy_idx /= 10) |
55682965 JB |
194 | digits++; |
195 | /* | |
196 | * deny the name if it is phy<idx> where <idx> is printed | |
197 | * without leading zeroes. taken == strlen(newname) here | |
198 | */ | |
199 | if (taken == strlen(PHY_NAME) + digits) | |
4bbf4d56 | 200 | return -EINVAL; |
2940bb69 EB |
201 | } |
202 | ||
203 | ||
204 | /* Ignore nop renames */ | |
2940bb69 | 205 | if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) |
4bbf4d56 | 206 | return 0; |
2940bb69 EB |
207 | |
208 | /* Ensure another device does not already have this name. */ | |
4bbf4d56 | 209 | list_for_each_entry(drv, &cfg80211_drv_list, list) |
2940bb69 | 210 | if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0) |
4bbf4d56 | 211 | return -EINVAL; |
55682965 | 212 | |
55682965 JB |
213 | result = device_rename(&rdev->wiphy.dev, newname); |
214 | if (result) | |
4bbf4d56 | 215 | return result; |
55682965 | 216 | |
33c0360b JB |
217 | if (rdev->wiphy.debugfsdir && |
218 | !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, | |
55682965 JB |
219 | rdev->wiphy.debugfsdir, |
220 | rdev->wiphy.debugfsdir->d_parent, | |
221 | newname)) | |
222 | printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", | |
223 | newname); | |
224 | ||
4bbf4d56 | 225 | nl80211_notify_dev_rename(rdev); |
55682965 | 226 | |
4bbf4d56 | 227 | return 0; |
55682965 JB |
228 | } |
229 | ||
704232c2 JB |
230 | /* exported functions */ |
231 | ||
232 | struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) | |
233 | { | |
638af073 DC |
234 | static int wiphy_counter; |
235 | ||
704232c2 JB |
236 | struct cfg80211_registered_device *drv; |
237 | int alloc_size; | |
238 | ||
41ade00f JB |
239 | WARN_ON(!ops->add_key && ops->del_key); |
240 | WARN_ON(ops->add_key && !ops->del_key); | |
241 | ||
704232c2 JB |
242 | alloc_size = sizeof(*drv) + sizeof_priv; |
243 | ||
244 | drv = kzalloc(alloc_size, GFP_KERNEL); | |
245 | if (!drv) | |
246 | return NULL; | |
247 | ||
248 | drv->ops = ops; | |
249 | ||
a1794390 | 250 | mutex_lock(&cfg80211_mutex); |
704232c2 | 251 | |
b5850a7a | 252 | drv->wiphy_idx = wiphy_counter++; |
a4d73ee1 | 253 | |
85fd129a | 254 | if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) { |
638af073 | 255 | wiphy_counter--; |
a1794390 | 256 | mutex_unlock(&cfg80211_mutex); |
704232c2 JB |
257 | /* ugh, wrapped! */ |
258 | kfree(drv); | |
259 | return NULL; | |
260 | } | |
704232c2 | 261 | |
a1794390 | 262 | mutex_unlock(&cfg80211_mutex); |
638af073 | 263 | |
704232c2 | 264 | /* give it a proper name */ |
b5850a7a | 265 | dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx); |
704232c2 | 266 | |
704232c2 JB |
267 | mutex_init(&drv->mtx); |
268 | mutex_init(&drv->devlist_mtx); | |
269 | INIT_LIST_HEAD(&drv->netdev_list); | |
2a519311 JB |
270 | spin_lock_init(&drv->bss_lock); |
271 | INIT_LIST_HEAD(&drv->bss_list); | |
704232c2 JB |
272 | |
273 | device_initialize(&drv->wiphy.dev); | |
274 | drv->wiphy.dev.class = &ieee80211_class; | |
275 | drv->wiphy.dev.platform_data = drv; | |
276 | ||
277 | return &drv->wiphy; | |
278 | } | |
279 | EXPORT_SYMBOL(wiphy_new); | |
280 | ||
281 | int wiphy_register(struct wiphy *wiphy) | |
282 | { | |
283 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
284 | int res; | |
8318d78a JB |
285 | enum ieee80211_band band; |
286 | struct ieee80211_supported_band *sband; | |
287 | bool have_band = false; | |
288 | int i; | |
f59ac048 LR |
289 | u16 ifmodes = wiphy->interface_modes; |
290 | ||
2a519311 JB |
291 | if (WARN_ON(wiphy->max_scan_ssids < 1)) |
292 | return -EINVAL; | |
293 | ||
f59ac048 LR |
294 | /* sanity check ifmodes */ |
295 | WARN_ON(!ifmodes); | |
296 | ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; | |
297 | if (WARN_ON(ifmodes != wiphy->interface_modes)) | |
298 | wiphy->interface_modes = ifmodes; | |
8318d78a JB |
299 | |
300 | /* sanity check supported bands/channels */ | |
301 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
302 | sband = wiphy->bands[band]; | |
303 | if (!sband) | |
304 | continue; | |
305 | ||
306 | sband->band = band; | |
307 | ||
881d948c JB |
308 | if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) |
309 | return -EINVAL; | |
310 | ||
311 | /* | |
312 | * Since we use a u32 for rate bitmaps in | |
313 | * ieee80211_get_response_rate, we cannot | |
314 | * have more than 32 legacy rates. | |
315 | */ | |
316 | if (WARN_ON(sband->n_bitrates > 32)) | |
8318d78a | 317 | return -EINVAL; |
8318d78a JB |
318 | |
319 | for (i = 0; i < sband->n_channels; i++) { | |
320 | sband->channels[i].orig_flags = | |
321 | sband->channels[i].flags; | |
322 | sband->channels[i].orig_mag = | |
323 | sband->channels[i].max_antenna_gain; | |
324 | sband->channels[i].orig_mpwr = | |
325 | sband->channels[i].max_power; | |
326 | sband->channels[i].band = band; | |
327 | } | |
328 | ||
329 | have_band = true; | |
330 | } | |
331 | ||
332 | if (!have_band) { | |
333 | WARN_ON(1); | |
334 | return -EINVAL; | |
335 | } | |
336 | ||
337 | /* check and set up bitrates */ | |
338 | ieee80211_set_bitrate_flags(wiphy); | |
339 | ||
a1794390 | 340 | mutex_lock(&cfg80211_mutex); |
f3b407fb | 341 | |
8318d78a | 342 | /* set up regulatory info */ |
7db90f4a | 343 | wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); |
704232c2 | 344 | |
704232c2 JB |
345 | res = device_add(&drv->wiphy.dev); |
346 | if (res) | |
347 | goto out_unlock; | |
348 | ||
349 | list_add(&drv->list, &cfg80211_drv_list); | |
350 | ||
351 | /* add to debugfs */ | |
352 | drv->wiphy.debugfsdir = | |
353 | debugfs_create_dir(wiphy_name(&drv->wiphy), | |
354 | ieee80211_debugfs_dir); | |
33c0360b JB |
355 | if (IS_ERR(drv->wiphy.debugfsdir)) |
356 | drv->wiphy.debugfsdir = NULL; | |
704232c2 | 357 | |
73d54c9e LR |
358 | if (wiphy->custom_regulatory) { |
359 | struct regulatory_request request; | |
360 | ||
361 | request.wiphy_idx = get_wiphy_idx(wiphy); | |
362 | request.initiator = NL80211_REGDOM_SET_BY_DRIVER; | |
363 | request.alpha2[0] = '9'; | |
364 | request.alpha2[1] = '9'; | |
365 | ||
366 | nl80211_send_reg_change_event(&request); | |
367 | } | |
368 | ||
704232c2 JB |
369 | res = 0; |
370 | out_unlock: | |
a1794390 | 371 | mutex_unlock(&cfg80211_mutex); |
704232c2 JB |
372 | return res; |
373 | } | |
374 | EXPORT_SYMBOL(wiphy_register); | |
375 | ||
376 | void wiphy_unregister(struct wiphy *wiphy) | |
377 | { | |
378 | struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy); | |
379 | ||
f16bfc1c | 380 | /* protect the device list */ |
a1794390 | 381 | mutex_lock(&cfg80211_mutex); |
704232c2 | 382 | |
f16bfc1c JB |
383 | BUG_ON(!list_empty(&drv->netdev_list)); |
384 | ||
385 | /* | |
386 | * Try to grab drv->mtx. If a command is still in progress, | |
387 | * hopefully the driver will refuse it since it's tearing | |
388 | * down the device already. We wait for this command to complete | |
389 | * before unlinking the item from the list. | |
390 | * Note: as codified by the BUG_ON above we cannot get here if | |
391 | * a virtual interface is still associated. Hence, we can only | |
392 | * get to lock contention here if userspace issues a command | |
393 | * that identified the hardware by wiphy index. | |
394 | */ | |
704232c2 | 395 | mutex_lock(&drv->mtx); |
f16bfc1c | 396 | /* unlock again before freeing */ |
704232c2 JB |
397 | mutex_unlock(&drv->mtx); |
398 | ||
3f2355cb LR |
399 | /* If this device got a regulatory hint tell core its |
400 | * free to listen now to a new shiny device regulatory hint */ | |
401 | reg_device_remove(wiphy); | |
402 | ||
f16bfc1c | 403 | list_del(&drv->list); |
704232c2 JB |
404 | device_del(&drv->wiphy.dev); |
405 | debugfs_remove(drv->wiphy.debugfsdir); | |
406 | ||
a1794390 | 407 | mutex_unlock(&cfg80211_mutex); |
704232c2 JB |
408 | } |
409 | EXPORT_SYMBOL(wiphy_unregister); | |
410 | ||
411 | void cfg80211_dev_free(struct cfg80211_registered_device *drv) | |
412 | { | |
2a519311 | 413 | struct cfg80211_internal_bss *scan, *tmp; |
704232c2 JB |
414 | mutex_destroy(&drv->mtx); |
415 | mutex_destroy(&drv->devlist_mtx); | |
2a519311 | 416 | list_for_each_entry_safe(scan, tmp, &drv->bss_list, list) |
78c1c7e1 | 417 | cfg80211_put_bss(&scan->pub); |
704232c2 JB |
418 | kfree(drv); |
419 | } | |
420 | ||
421 | void wiphy_free(struct wiphy *wiphy) | |
422 | { | |
423 | put_device(&wiphy->dev); | |
424 | } | |
425 | EXPORT_SYMBOL(wiphy_free); | |
426 | ||
427 | static int cfg80211_netdev_notifier_call(struct notifier_block * nb, | |
428 | unsigned long state, | |
429 | void *ndev) | |
430 | { | |
431 | struct net_device *dev = ndev; | |
432 | struct cfg80211_registered_device *rdev; | |
433 | ||
434 | if (!dev->ieee80211_ptr) | |
435 | return 0; | |
436 | ||
437 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); | |
438 | ||
60719ffd JB |
439 | WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED); |
440 | ||
704232c2 JB |
441 | switch (state) { |
442 | case NETDEV_REGISTER: | |
443 | mutex_lock(&rdev->devlist_mtx); | |
444 | list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list); | |
445 | if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, | |
446 | "phy80211")) { | |
447 | printk(KERN_ERR "wireless: failed to add phy80211 " | |
448 | "symlink to netdev!\n"); | |
449 | } | |
450 | dev->ieee80211_ptr->netdev = dev; | |
451 | mutex_unlock(&rdev->devlist_mtx); | |
452 | break; | |
453 | case NETDEV_UNREGISTER: | |
454 | mutex_lock(&rdev->devlist_mtx); | |
455 | if (!list_empty(&dev->ieee80211_ptr->list)) { | |
456 | sysfs_remove_link(&dev->dev.kobj, "phy80211"); | |
457 | list_del_init(&dev->ieee80211_ptr->list); | |
458 | } | |
459 | mutex_unlock(&rdev->devlist_mtx); | |
460 | break; | |
461 | } | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static struct notifier_block cfg80211_netdev_notifier = { | |
467 | .notifier_call = cfg80211_netdev_notifier_call, | |
468 | }; | |
469 | ||
470 | static int cfg80211_init(void) | |
471 | { | |
b2e1b302 LR |
472 | int err; |
473 | ||
b2e1b302 | 474 | err = wiphy_sysfs_init(); |
704232c2 JB |
475 | if (err) |
476 | goto out_fail_sysfs; | |
477 | ||
478 | err = register_netdevice_notifier(&cfg80211_netdev_notifier); | |
479 | if (err) | |
480 | goto out_fail_notifier; | |
481 | ||
55682965 JB |
482 | err = nl80211_init(); |
483 | if (err) | |
484 | goto out_fail_nl80211; | |
485 | ||
704232c2 JB |
486 | ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); |
487 | ||
b2e1b302 LR |
488 | err = regulatory_init(); |
489 | if (err) | |
490 | goto out_fail_reg; | |
491 | ||
704232c2 JB |
492 | return 0; |
493 | ||
b2e1b302 LR |
494 | out_fail_reg: |
495 | debugfs_remove(ieee80211_debugfs_dir); | |
55682965 JB |
496 | out_fail_nl80211: |
497 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); | |
704232c2 JB |
498 | out_fail_notifier: |
499 | wiphy_sysfs_exit(); | |
500 | out_fail_sysfs: | |
501 | return err; | |
502 | } | |
b2e1b302 | 503 | |
3a462465 | 504 | subsys_initcall(cfg80211_init); |
704232c2 JB |
505 | |
506 | static void cfg80211_exit(void) | |
507 | { | |
508 | debugfs_remove(ieee80211_debugfs_dir); | |
55682965 | 509 | nl80211_exit(); |
704232c2 JB |
510 | unregister_netdevice_notifier(&cfg80211_netdev_notifier); |
511 | wiphy_sysfs_exit(); | |
b2e1b302 | 512 | regulatory_exit(); |
704232c2 JB |
513 | } |
514 | module_exit(cfg80211_exit); |